CN2531186Y - Double-shaft water sealed butterfly valve - Google Patents

Abstract

The utility model provides a double-shaft water seal butterfly valve, which is characterized in that a bivalve shaft, a double butterfly plates form, and a triple eccentric structure are used, the triple eccentricity separately are a first eccentricity E1 of a sealing pair interface and a center line of the valve shaft, a second eccentricity E2 of the center lines of the valve shaft and the valve body, and a thrice eccentricity E3 between the two valve shafts. The two valve shafts are driven by the same transmission device, the synchronous open and close actions are ensured by the mechanical connection of a swing and a connecting rod. The utility model has advantages in that the valve sealing pair can be separated fast at the opening transient without the relative friction, therefore prolong the service life; the bivalve shaft structure is used, therefore simplifying the techniques of processing and assembling, and improving the sealing reliability.

Description

The twin shaft Water seal butterfly valve

The utility model relates to a kind of twin shaft Water seal butterfly valve, is applicable to that the pipe-line system of poisonous and harmful medium transport is made safe partition apparatus usefulness.

At present the Water seal butterfly valve that uses is made up of parts such as valve body, valve shaft, two valve seats, butterfly plate, seal rings, butterfly plate is made up of the sealing surface of two symmetrical parallel, form cavity between two sealing surfaces and make high pressure water seal chamber usefulness, two sealing surfaces are driven by a valve shaft that is positioned at symmetry center.Water before the valve opening in the first emptying lumen, and then open is closed water that the back lumen charges into certain pressure and is done water seal and use.Its shortcoming one is because of the valve shaft centre-driven, so contact all the time between the sealing pair in the driving process, on the one hand friction torque is big, be sealing pair on the other hand because of being in contact condition all the time, and an end seal ring will all produce relative friction and cause seal ring to be lacked working life with two valve seats; The 2nd, because the sealing cone of two valve seats is reciprocal on the valve body, add the inevitable coaxiality error that produces in man-hour, the axis hole of spring bearing can not guarantee the symmetry center position at two valve seats fully, butterfly plate processing also faces same problem, cause sealed increscence amount periphery unequal and produce and leak thus, valve seat with opposing side when serious produces interference, tears seal ring and the loss of seal function.

It is little that the purpose of this utility model provides a kind of friction torque, and good seal performance is easy to the twin shaft Water seal butterfly valve of processing and assembling.

The utility model is achieved through the following technical solutions, it is made of valve body, two valve seats, two valve shafts, double butterfly plate etc., adopt three eccentric structures, be the once eccentric of sealing pair surface of contact and valve shaft center line, the secondary off-centre of valve shaft center line and valve body center line, three off-centre between two valve shafts.Two valve shafts drive butterfly plate half-twist separately respectively again by same actuator drives, realize the opening and closing of valve.Two valve shafts are connected with connecting rod by swing arm, realize that switching motion is synchronous.

The utility model has the advantages that rational in infrastructurely, utilize eccentric principle, the valve seal pair can be thrown off rapidly in the moment of opening, and did not have friction relatively, had prolonged working life; Adopt the two butterfly plate structures of bivalve axle, simplified processing and assembling, and the sealed increscence amount periphery is impartial, improved the reliability of sealing.

The utility model both can make the soft seal form, can make the form usefulness of hard sealing again, to be applicable to the medium requirement of different temperatures.

Below in conjunction with drawings and Examples the utility model is described in further detail:

Fig. 1 is the existing centrosymmetric structural drawing of Water seal butterfly valve valve shaft.

The plan view of a kind of twin shaft Water seal butterfly valve that Fig. 2 provides for the utility model.

Fig. 3 is the A-A sectional view of Fig. 2.

Fig. 4 is a valve shaft synchronization motion schematic diagram of mechanism.

Wherein: 1, transmission device; 2, support; 3, valve body; 4, valve seat; 5, seal ring; 6, pressing plate; 7, screw; 8, butterfly plate; 9, valve shaft; 10, swing arm; 11, connecting rod; 12, pin; E1, E2, E3 are throw of eccentric.

Valve shaft center symmetry among Fig. 1, its shortcoming one is contact all the time between the sealing pair in the driving process, and friction torque is big, during valve opening, when valve shaft drive butterfly plate was rotated counterclockwise, the seal ring at B place will all produce relative friction and cause valve short working life with two valve seats among the figure; The 2nd, processing, assembling difficulty easily cause leaking, and influence sealing effect.

As Fig. 2, Figure 3 shows that the utility model structural representation, valve seat 4 are symmetrically welded in valve body 3, seal ring 5 is loaded in the groove on the butterfly plate 8 by pressing plate 6, its magnitude of interference is regulated by the screw on the pressing plate 67.Adopt three eccentric structures, be the once eccentric E1 of the center line of seal ring 5 and valve seat 4 surface of contact and valve shaft 9, the eccentric E2 of the center line secondary of valve shaft 9 center lines and valve body 3, three eccentric E3 between two valve shafts 9, because eccentric existence, sealing pair can be thrown off rapidly in the moment of opening, and did not have friction relatively, had prolonged working life.Valve shaft 9 is two respectively with butterfly plate 8, has simplified processing and assembly technology, and the sealed increscence amount periphery is impartial, has improved the reliability of sealing.Two valve shafts 9 are driven by same transmission device 1, drive butterfly plate 10 half-twists separately, realize the opening and closing of valve.Transmission device 1 links to each other by support 2 with valve body 3, is connected with pin 12 by swing arm 10, connecting rod 11 between two valve shafts 9, realizes that switching motion is synchronous.Swing arm when solid line partly is valve closing among Fig. 4, connecting rod position, swing arm when dotted line is valve opening, link motion track.

In sum, the utility model compared with prior art mainly has the following advantages:

1, keying moment is little, flexible operation;

2, sealing property is reliable, long service life;

3, processing, assembly technology are simple.

Claims (3)

1, a kind of twin shaft Water seal butterfly valve is characterized in that: adopt two valve shafts, the structural type of two butterfly plates.

2, according to the described twin shaft Water seal butterfly valve of claim (1), it is characterized in that adopting three eccentric structures, be the once eccentric E1 of sealing pair surface of contact and valve shaft center line, three eccentric E3 between the eccentric E2 of the secondary of valve shaft center line and valve body center line, two valve shafts.

3, according to claim (1) or (2) described twin shaft Water seal butterfly valve, it is characterized in that two valve shafts are driven by same transmission device, by the mechanical connection of swing arm and connecting rod, guarantee that switching motion is synchronous between two valve shafts.

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